XAF实现运行时填加验证规则并保存到数据库中
有 几种 方法 可以 用来 声明 一个 验证 规则 。 最常用的方法是使用对应的Attribute来定义。详见这里。 验证 模块还 允许 您 通过 在 业务 类 实现 IRuleSource 接口 定义 自定义 的 验证 规则的来 源 。 IRuleSource 接口 公开 两个 成员 。 名称 属性 应
有几种方法可以用来声明一个验证规则。最常用的方法是使用对应的Attribute来定义。详见这里。验证模块还允许您通过在业务类实现 IRuleSource 接口定义自定义的验证规则的来源。 IRuleSource 接口公开两个成员。名称属性应返回自定义的验证规则源的唯一名称。CreateRules 方法应实例化自定义的验证规则。 一个场景中，您可能需要实现自定义验证规则来源执行验证规则存储在数据库中。可以使用这种方法，当您需要频繁地自定义验证规则在已部署的应用程序中，但您不能重新部署应用程序或自定义其应用程序模型。 下面的示例阐释了此方案。
此示例所示的 RuleRequiredFieldPersistent 类是一个普通的业务类。类实现 IRuleSource 接口，并用于创建和存储在数据库中的 RuleRequiredField 验证规则。在 CreateRules 方法中实例化一个 RuleRequiredField 验证规则，基于 RuleRequiredFieldPersistent 类的公共属性的值。RuleRequiredFieldPersistent 类标记 DefaultClassOptionsAttribute，以便最终用户可以手动创建验证规则通过相应的列表视图。
<span style="color: #000000;">[DefaultClassOptions]
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> RuleRequiredFieldPersistent : BaSEObject,
DevExPRess.Persistent.Validation.IRuleSource {
</span><span style="color: #0000ff;">public</span> RuleRequiredFieldPersistent(session session) : <span style="color: #0000ff;">base</span><span style="color: #000000;">(session) { }
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> RuleName {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuestring>(<span style="color: #800000;">"</span><span style="color: #800000;">RuleName</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">RuleName</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> CustomMessageTemplate {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuestring>(<span style="color: #800000;">"</span><span style="color: #800000;">CustomMessageTemplate</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">CustomMessageTemplate</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">bool</span><span style="color: #000000;"> SkipNullOrEmptyValues {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuebool>(<span style="color: #800000;">"</span><span style="color: #800000;">SkipNullOrEmptyValues</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">SkipNullOrEmptyValues</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> Id {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuestring>(<span style="color: #800000;">"</span><span style="color: #800000;">Id</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">Id</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">bool</span><span style="color: #000000;"> InvertResult {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuebool>(<span style="color: #800000;">"</span><span style="color: #800000;">InvertResult</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">InvertResult</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> ContextIDs {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuestring>(<span style="color: #800000;">"</span><span style="color: #800000;">ContextIDs</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">ContextIDs</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> Property {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValuestring>(<span style="color: #800000;">"</span><span style="color: #800000;">Property</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">Property</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
[Persistent(</span><span style="color: #800000;">"</span><span style="color: #800000;">ObjectType</span><span style="color: #800000;">"</span><span style="color: #000000;">)]
</span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> ObjectType {
</span><span style="color: #0000ff;">get</span><span style="color: #000000;"> {
</span><span style="color: #0000ff;">if</span>(ObjectTypeCore != <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
</span><span style="color: #0000ff;">return</span><span style="color: #000000;"> ObjectTypeCore.FullName;
}
</span><span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span><span style="color: #000000;">;
}
</span><span style="color: #0000ff;">set</span> { ObjectTypeCore =<span style="color: #000000;"> ReflectionHelper.FindType(value); }
}
[NonPersistent]
[TypeConverter(</span><span style="color: #0000ff;">typeof</span><span style="color: #000000;">(DevExpress.Persistent.Base.LocalizedClassInfoTypeConverter))]
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Type ObjectTypeCore {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> GetPropertyValue<type>(<span style="color: #800000;">"</span><span style="color: #800000;">ObjectTypeCore</span><span style="color: #800000;">"</span><span style="color: #000000;">); }
</span><span style="color: #0000ff;">set</span> { SetPropertyValue(<span style="color: #800000;">"</span><span style="color: #800000;">ObjectTypeCore</span><span style="color: #800000;">"</span><span style="color: #000000;">, value); }
}
</span><span style="color: #0000ff;">#region</span> IRuleSource Members
<span style="color: #0000ff;">public</span> System.Collections.Generic.ICollection<irule><span style="color: #000000;"> CreateRules() {
System.Collections.Generic.List</span><irule> list = <span style="color: #0000ff;">new</span> System.Collections.Generic.List<irule><span style="color: #000000;">();
RuleRequiredField rule </span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> RuleRequiredField();
rule.Properties.SkipNullOrEmptyValues </span>= <span style="color: #0000ff;">this</span><span style="color: #000000;">.SkipNullOrEmptyValues;
rule.Properties.Id </span>= <span style="color: #0000ff;">this</span><span style="color: #000000;">.Id;
rule.Properties.InvertResult </span>= <span style="color: #0000ff;">this</span><span style="color: #000000;">.InvertResult;
rule.Properties.CustomMessageTemplate </span>= <span style="color: #0000ff;">this</span><span style="color: #000000;">.CustomMessageTemplate;
rule.Properties.TargetContextIDs </span>= <span style="color: #0000ff;">new</span> ContextIdentifiers(<span style="color: #0000ff;">this</span><span style="color: #000000;">.ContextIDs);
rule.Properties.TargetType </span>= <span style="color: #0000ff;">this</span><span style="color: #000000;">.ObjectTypeCore;
</span><span style="color: #0000ff;">if</span>(rule.Properties.TargetType != <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
</span><span style="color: #0000ff;">foreach</span>(PropertyInfo pi <span style="color: #0000ff;">in</span><span style="color: #000000;"> rule.Properties.TargetType.GetProperties()) {
</span><span style="color: #0000ff;">if</span>(pi.Name == <span style="color: #0000ff;">this</span><span style="color: #000000;">.Property) {
rule.Properties.TargetPropertyName </span>=<span style="color: #000000;"> pi.Name;
}
}
}
</span><span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i = Validator.RuleSet.RegisteredRules.Count - <span style="color: #800080;">1</span>; i >= <span style="color: #800080;">0</span>; i--<span style="color: #000000;">) {
</span><span style="color: #0000ff;">if</span>(Validator.RuleSet.RegisteredRules[i].Id == <span style="color: #0000ff;">this</span><span style="color: #000000;">.Id) {
Validator.RuleSet.RegisteredRules.RemoveAt(i);
}
}
list.Add(rule);
</span><span style="color: #0000ff;">return</span><span style="color: #000000;"> list;
}
[Browsable(</span><span style="color: #0000ff;">false</span><span style="color: #000000;">)]
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">string</span><span style="color: #000000;"> Name {
</span><span style="color: #0000ff;">get</span> { <span style="color: #0000ff;">return</span> <span style="color: #0000ff;">this</span><span style="color: #000000;">.RuleName; }
}
</span><span style="color: #0000ff;">#endregion</span><span style="color: #000000;">
}</span></irule></irule></irule></type>可以看到，这个示例中，只返回了一个规则，而在实际项目中，可以使用BO定义一个子集合，集合中定义N种规则。
不要定义N个BO并都实现 IRuleSource 那样有点浪费。
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